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Evolution of the Grenville terrane in the central Virginia Appalachians

A. K. Sinha
A. K. Sinha
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M. J. Bartholomew
M. J. Bartholomew
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January 01, 1984

Along a transect across the central Virginia Blue Ridge complex, the terrane is divisible into two discrete massifs—the Pedlar and the Lovingston, which are separated by the mid-Paleozoic Rockfish Valley fault. The Pedlar Massif is characterized by two major lithologies—an older volcanic sequence (1130 m.y.) intruded by the younger Pedlar River Charnockite Suite (1070 m.y.). The Lovingston Massif has a more complex association of rock types that include an older paragneissic sequence (Stage Road Layered Gneiss) with approximately 1870 m.y. old detrital zircons and intruded by quartz monzonite, pegmatite and charnockite of the Archer Mountain Suite, as well as anorthosites (1100 m.y.). The entire Blue Ridge complex terrane was subjected to granulite grade metamorphism approximately 920 m.y. ago. Later igneous activity is recorded at ∼7 00 m.y. as the Rockfish River granodiorite and Catoctin greenstones.

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GSA Special Papers

The Grenville Event in the Appalachians and Related Topics

Mervin J. Bartholomew
Mervin J. Bartholomew
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Geological Society of America
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January 01, 1984



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